Image formation for object at 2f in converging lens

Steps:

• Use lens formula with sign convention: u = -2f (object distance), f positive for converging lens.
• Compute 1/v = 1/f + 1/u = 1/f - 1/(2f) = 1/(2f), so v = +2f (real image on opposite side).
• Calculate magnification m = v/u = 2f / (-2f) = -1 (negative sign means inverted).
• Image is real, same size, inverted, and on the opposite side of the lens.

Why B is correct:

• Negative magnification from the lens formula indicates an inverted image relative to the object.

Why the others are wrong:

• A: |m| = 1, so image is same size, not enlarged.
• C: Positive v places image on the opposite side from the object.
• D: Positive v means real image, not virtual.

Final answer: B